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Code d'Examen: 640-875
Nom d'Examen: Cisco (Building Cisco Service Provider Next-Generation Networks, Part 1)
Questions et réponses: 105 Q&As
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NO.1 When EIGRP is enabled on Cisco IOS XR, which EIGRP feature is on by default?
A. no auto-summary
B. stub routing
C. unequal cost paths load-balancing
D. no ip eigrp split-horizon
E. eigrp authentication
Answer: A
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NO.2 With IPv6, for which purpose are router solicitation and router advertisement used?
A. routing protocol updates
B. routing protocol neighbor peerings
C. router and prefix discovery
D. Layer 3 to Layer 2 address resolution (similar to IPv4 ARP)
Answer: C
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NO.3 Refer to the exhibit.
Company 1 has merged with Company 2. Company 1 is using RIPv2 as its IGP and Company 2 is using
EIGRP as its IGP. EIGRP also is running between R1 and R2 over the WAN link.
Which action must be taken to allow these two configurations?
The Company 1 RIP routes appear as external EIGRP routes within Company 2.
The Company 2 EIGRP routes appear as RIPv2 routes within Company 1.
A. Enable RIPv2 on the R2 router.
B. Enable RIPv2 on the R2 router and on all internal routers of Company 2. Enable EIGRP on all internal
routers of Company 1.
C. Configure mutual route redistribution between RIPv2 and EIGRP on the R1 and R2 routers.
D. Configure mutual route redistribution between RIPv2 and EIGRP on the R1 router.
E. Configure mutual route redistribution between RIPv2 and EIGRP on the R2 router.
Answer: D
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NO.4 Which two statements about IPv4 DHCP operations are true? (Choose two.)
A. If the DHCP clients and servers are on the same subnet, DHCP uses UDP broadcasts to communicate
between the clients and servers.
B. The DHCP server that receives a DHCPDISCOVER message may respond with a DHCPOFFER
message on UDP port 67.
C. A client can receive DHCPOFFER from multiple servers and it can accept all the offers by broadcasting
the DHCPREQUEST message to all the servers.
D. A DHCP relay is required if the DHCP clients and the servers are on the same subnet.
E. If the client and server are on different subnets, DHCPDISCOVER and DHCPREQUEST messages
are sent via UDP broadcasts, but DHCPOFFER and DHCPACK messages are unicast.
F. The client broadcasts a DHCPDISCOVER message on UDP port 68 with its own MAC address to
discover available DHCP servers.
Answer: AE
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NO.5 Which three statements about the ARP function are true? (Choose three.)
A. ARP is used to determine an IP address.
B. An ARP request is broadcast at Layer 3.
C. An ARP response is broadcast at Layer 2.
D. ARP tables are maintained on Layer 3 devices.
E. The destination MAC address of an ARP request is that of the ARP responder.
F. ARP requests are broadcast at Layer 2.
G. ARP resolves MAC addresses to NET addresses.
H. ARP uses 0x0806 as the Type field in an Ethernet frame.
Answer: DFH
Cisco examen 640-875 certification 640-875
NO.6 You are having problems browsing to http://www.cisco.com from your laptop that is running Windows.
Your laptop is connected directly to a default gateway, which is a Cisco ISR G2 router. Which four options
are the basic troubleshooting steps that you should use to troubleshoot this issue? (Choose four.)
A. Issue the ipconfig command from the Windows command line on your laptop to determine your laptop
IP address and the default gateway IP address.
B. Issue the ipconfig /all command from the Windows command line on your laptop to determine the DNS
server IP address.
C. Issue the ping {default gateway IP address} command from the Windows command line on your laptop
to verify connectivity to the default gateway.
D. Issue the ping {DNS server IP address} command from the Windows command line on your laptop to
verify connectivity to the DNS server.
E. Issue the ping tcp www.cisco.com 80 command from the Windows command line on your laptop to
verify TCP port 80 connectivity to the www.cisco.com server.
F. From the ISR G2 CLI, issue the ping tcp www.cisco.com 80 command to verify TCP port 80 connectivity
to the www.cisco.com server.
G. From the ISR G2 CLI, issue the ISR-G2#tracert www.cisco.com command to verify connectivity to the
www.cisco.com server.
H. From the ISR G2 CLI, issue the ISR-G2#nslookup www.cisco.com command to determine the IP
address of the www.cisco.com server.
Answer: ABCD
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NO.7 If a bridge port is in the non-designated state, which two statements about spanning-tree operations on
this port are true? (Choose two.)
A. This port is in the Forwarding state.
B. This port sends BPDUs on the attached link.
C. This port has the lowest cost to the root bridge.
D. This port is considered the root port.
E. This port receives BPDUs.
F. This port is in the Blocked state.
Answer: EF
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NO.8 Given the IP address of 209.168.200.155/27, which two options are the subnet that this IP address
belongs to and the subnet broadcast IP address? (Choose two.)
A. 209.168.200.64 255.255.255.224
B. 209.168.200.96 255.255.255.224
C. 209.168.200.128 255.255.255.224
D. 209.168.200.95
E. 209.168.200.127
F. 209.168.200.159
Answer: CF
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NO.9 Which statement about IPv6 global unicast addresses is true.?
A. The first 3 bits is 001.
B. The first 4 bits is 0011.
C. The first 4 bits is 1111.
D. The first 16 bits is FE80 in hex.
E. The first 16 bits is FF00 in hex.
F. The first 16 bits is 2002 in hex.
G. The first 16 bits is 3FFE in hex.
Answer: A
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NO.10 Which Cisco IOS CLI command is used to verify the speed and duplex settings on the Fa0/1 port on a
Cisco switch?
A. show ip interfaces fa0/1
B. show interfaces fa0/1
C. show interfaces fa0/1 switchport
D. show ip interfaces brief
E. show interfaces switchport
Answer: B
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NO.11 Given the IP address 10.106.170.145 255.248.0.0, which three options are the subnet that this IP
address belongs to, the host IP address range on this subnet, and the subnet broadcast IP
address?(Choose three.)
A. subnet = 10.104.0.0/13
B. subnet = 10.106.0.0/13
C. subnet = 10.112.0.0/13
D. host IP address range = 10.104.0.1 to 10.111.255.254
E. host IP address range = 10.106.0.1 to 10.106.255.254
F. host IP address range = 10.106.0.1 to 10.119.255.254
G. subnet broadcast IP address = 10.106.255.255
H. subnet broadcast IP address = 10.111.255.255
I. subnet broadcast IP address = 10.119.255.255
Answer: ADH
certification Cisco 640-875 640-875
NO.12 Refer to the exhibit.
Given the Class C IP network of 192.168.1.0, using VLSM, which five subnets meet the requirements in
the exhibit? (Choose five.)
A. 192.168.1.0/27
B. 192.168.1.32/27
C. 192.168.1.48/27
D. 192.168.1.48/28
E. 192.168.1.64/28
F. 192.168.1.80/28
G. 192.168.1.80/29
H. 192.168.1.88/30
I. 192.168.1.96/30
Answer: ABEFI
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NO.13 Which two statements about classful or classless routing protocol operations are true? (Choose two.)
A. Classful routing protocols do not send subnet mask information with their routing updates
B. Variable-length subnet masks are supported when using classful routing protocols.
C. Examples of classless routing protocols include RIPv1, EIGRP, OSPF, and IS-IS.
D. Classful routing protocols do not support discontiguous subnets.
Answer: AD
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NO.14 This show output is from the S7 Cisco Metro Switch and the PE7 Cisco ASR 9000 Series Router. Which
configuration change(s) is/are needed to bring the S7 FastEthernet 0/2 interface into the up/up state?
S7#show cdp neighbors
<OUTPUT OMITTED>
*Mar 20 21:28:02.177: %ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD:
Collisions at FastEthernet0/2 exceed threshold. Considered as loop-back.
*Mar 20 21:28:02.177: %PM-4-ERR_DISABLE: loopback error detected on Fa0/2, putting Fa0/2 in
err-disable state
*Mar 20 21:28:03.184: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed
state to down
S7#show interface fa0/2
FastEthernet0/2 is down, line protocol is down (err-disabled)
Hardware is Fast Ethernet, address is e8ba.70b5.6c04 (bia e8ba.70b5.6c04)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:40, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
484423 packets input, 39349929 bytes, 0 no buffer
Received 484423 broadcasts (167203 multicasts)
0 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 167203 multicast, 0 pause input
0 input packets with dribble condition detected
972398 packets output, 128931949 bytes, 0 underruns
0 output errors, 46 collisions, 4 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
RP/0/RSP0/CPU0:PE7#show interfaces gi0/0/0/0
GigabitEthernet0/0/0/0 is down, line protocol is down
Interface state transitions: 4
Hardware is GigabitEthernet, address is 4055.392f.40a8 (bia 4055.392f.40a8)
Internet address is 192.168.107.70/24
MTU 1514 bytes, BW 100000 Kbit (Max: 100000 Kbit)
reliability 255/255, txload 0/255, rxload 0/255
Encapsulation ARPA,
Full-duplex, 100Mb/s, THD, link type is force-up
output flow control is off, input flow control is off
loopback not set,
ARP type ARPA, ARP timeout 04:00:00
Last input 00:00:00, output 00:00:35
Last clearing of "show interface" counters never
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
972551 packets input, 128953765 bytes, 729 total input drops
172486 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 800781 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
484545 packets output, 39360900 bytes, 0 total output drops
Output 317283 broadcast packets, 167262 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
4 carrier transitions
A. Enable loopback line on the S7 Fa0/2 interface then shut and no shut the Fa0/2 interface.
B. Enable duplex half on the PE7 Gi0/0/0/0 interface then shut and no shut the Fa0/2 interface on S7.
C. Change S7 Fa0/2 interface to duplex full and speed 100 then shut and no shut the Fa0/2 interface.
D. Just need to no shut the Fa0/2 interface on S7.
E. Just need to shut and no shut the Fa0/2 interface on S7.
Answer: C
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NO.15 Which three physical lines can provide local or remote access to a Cisco router or switch? (Choose
three.)
A. console port
B. modem port
C. virtual terminal lines
D. switch fabric interface
E. aux port
F. managementEthernet0/RSP0/CPU0/0
Answer: AEF
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